An elevation is different. It shows the face of something, or perhaps more correct, the projection of an object/s to a plane. But my testing suggests it produces SECTIONS, not elevations.
Yes, you can use abbreviations in tables and figures. All abbreviations used in tables and figures should be defined in the table note or figure caption, respectively, even though the abbreviations will be also be defined in the text if they are used there.
Punctuation used to indicate abbreviations (for example a full stop at the end or a slash between two letters) are generally omitted in this list. Where an abbreviation is mainly found on a particular kind of drawing the type of drawing is indicated in brackets.